/Engine/Source/Editor/SceneOutliner/Public/SceneOutlinerGutter.h
A gutter for the SceneOutliner which handles setting and visualizing item visibility
class FSceneOutlinerGutter : public [ISceneOutlinerColumn](API\Editor\SceneOutliner\ISceneOutlinerColumn)
FSceneOutlinerV...
VisibilityCache
Get and cache visibility for items. Cached per-frame to avoid expensive recursion.
TWeakPtr<IScen...
WeakOutliner
Weak pointer back to the scene outliner - required for setting visibility on current selection.